<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			p::before{
				content: attr(data-username);
				/* attr属性 */
			}
		</style>
	</head>
	<body>
		<p data-username="张永辉">,欢迎您再次来到本网站</p>
	</body>
</html>
